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This change creates InfobarTranslateCoordinator and
implements the basic methods of an InfobarCoordinator and TranslateInfoBarDelegate.
It also creates kInfobarTypeTranslate and expands infobar_metrics_recorder to handle
this case.

Bug: 1014959
Change-Id: I994abf7205f405da3aa20f0fb726a3701b6a145d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1864716Reviewed-by: Sergio Collazos <sczs@chromium.org>
Reviewed-by: Peter Lee <pkl@chromium.org>
Commit-Queue: Chris Lu <thegreenfrog@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707491}